WO2015096085A1

WO2015096085A1 - Oil-submersible linear motor oil extraction system

Info

Publication number: WO2015096085A1
Application number: PCT/CN2013/090532
Authority: WO
Inventors: 王光能; 曹卉; 张鹏勇; 高云峰
Original assignee: 深圳市大族激光科技股份有限公司; 深圳市大族电机科技有限公司
Priority date: 2013-12-26
Filing date: 2013-12-26
Publication date: 2015-07-02
Also published as: RU2616023C1; US20160102535A1; CN105874156A; CA2912115C; CA2912115A1

Abstract

An oil-submersible linear motor oil extraction system, comprising an oil-submersible linear motor (100), an oil-well pump (200), a sealing device assembly (300) and a ventilator (400) installed underground; the oil-submersible linear motor (100) comprises a stator (10) and a mover (20) moving in a linear motion within the stator (10); the oil-well pump (200) comprises a pump cylinder (32), a plunger (34), a bridging pipe (36) and an oil inlet sieve conduit (38); the sealing device assembly (300) is arranged between the oil-submersible linear motor (100) and the oil-well pump (200); the ventilator (400) is arranged at the lower end of the oil-submersible linear motor (100) and is used for balancing the internal and external pressure of the oil-submersible linear motor (100). The present system omits the sucker rod of existing oil extraction systems, avoiding stroke loss caused by sucker rod elongation and energy loss caused by the weight of the sucker rod and pipe rod offset grinding, thereby improving the efficiency of the system.

Description

Submersible linear motor production system

[Technical Field]

The invention relates to an oil recovery system, in particular to a high-efficiency submersible linear motor production system.

【Background technique】

The traditional oil production equipment mainly uses the beam pumping unit (tank machine) for oil and oil collection. In this oil production process, the steamed bread machine is a mechanical power device, which passes through the sucker rod of the kilometer or more and the plunger of the oil pump. Connected, it drives the pump plunger to reciprocate to pump underground oil to the ground. The main disadvantages are: high energy consumption, low pump efficiency, slanting of the sucker rod and the outflow pipe, and need to stop the adjustment and narrow the scope of adjustment.

The linear motor driven submersible pumping unit directly converts electric energy into linear reciprocating mechanical energy, which not only simplifies the mechanical transmission process, but also effectively improves the efficiency. The pumping parameters can be adjusted steplessly, in order to realize automatic control and meet the oil recovery process. The requirements are provided and it is a new type of pumping unit with a promising future. However, there is still much room for improvement in the efficiency of conventional pumping units.

[Summary of the Invention]

Based on this, it is necessary to provide a more efficient submersible linear motor production system.

A submersible linear motor production system includes a submersible linear motor, an oil pump, a sealer assembly and a respirator installed in an underground; the submersible linear motor includes a stator and a linear motion in the stator The oil pump includes a pump cylinder, a plunger, a bridge tube, and an oil inlet screen, the pump cylinder is disposed in the bridge tube, and the plunger is connected to the upper end of the mover, and a linear motion is formed in the pump cylinder, an oil chamber is formed between the plunger and the pump cylinder, and a first return chamber is formed between the bridge tube and the pump cylinder, and the oil inlet screen is disposed. a lower end of the bridge tube and communicating with an oil suction chamber inside the plunger; the sealer assembly is disposed between the submersible linear motor and the oil pump; the respirator is disposed at The lower end of the submersible linear motor is used to balance the pressure inside and outside the submersible linear motor.

In one embodiment, the stator includes a stator inner tube, a stator outer tube, and a plurality of coils disposed between the stator inner tube and the stator outer tube, the coil being wound by a wire into a circular line The cake is potted by epoxy resin, and a silicon steel sheet assembly is disposed between adjacent coils, and the coil is insulated from the silicon steel sheet assembly.

In one of the embodiments, the stator further includes a cable connected to the coil, the stator being coupled to the control system of the ground by the cable.

In one embodiment, the stator further includes a motor upper joint and a motor lower joint at both ends of the stator outer tube, and the submersible linear motor is connected to the sealer assembly through the motor upper joint, and The motor is connected to the respirator through the lower joint of the motor, and a glue is injected between the upper joint of the motor, the lower joint of the motor, the inner tube of the stator and the outer tube of the stator, so that the whole stator is solidified as a whole.

In one embodiment, the mover includes the mover inner tube, a plurality of permanent magnets, a plurality of magnetic conductive rings, and a plurality of wear rings, and the plurality of permanent magnets are sleeved in the mover In the tube, the magnetization direction of each permanent magnet is an axial direction, and the magnetization directions of two adjacent permanent magnets are opposite, and the plurality of magnetic conductive rings are sleeved on the inner tube of the mover, and each guide The magnetic ring is disposed between two adjacent permanent magnets, and the plurality of wear rings are sleeved on the inner tube of the mover, and a plurality of permanent magnets are disposed between each two wear rings, the plurality of The wear ring forms a friction pair with the inner tube of the stator.

In one embodiment, the mover further includes a plurality of mover outer tubes, each of the mover outer tubes is sleeved on the permanent magnet and the magnetically permeable ring, and is located between the two wear rings The outer diameter of the outer tube of the mover is smaller than the outer diameter of the wear ring.

In one embodiment, the mover further includes two lock nuts disposed at two ends of the outer tube of the mover for pressing the permanent magnet and the magnetic conductive ring.

In one embodiment, the inner tube of the mover is a hollow structure, and the mover and the stator are filled with lubricating oil, and the lubricating oil flows through the inside of the inner tube of the mover.

In one embodiment, the pump barrel includes an upper pump barrel and a lower pump barrel fixedly coupled to the upper pump barrel, the plunger including an upper plunger and a lower plunger fixedly coupled to the upper plunger The inside of the upper plunger forms an oil suction chamber, and an oil chamber is formed between the upper plunger and the upper pump cylinder, and a top end of the upper plunger is further provided with the oil extraction chamber and the a swimming valve of the oil discharge chamber, a top end of the upper pump cylinder is provided with a fixed valve connecting the oil discharge chamber and the first return chamber, and a second is formed between the lower plunger and the upper pump cylinder a return chamber, the second return chamber being in communication with the first return chamber.

In one embodiment, the inside of the lower plunger forms an oil suction chamber, and a check valve is further disposed between the lower plunger and the upper plunger, and the well fluid passes through the one-way valve from the oil suction chamber. The valve enters the pumping chamber.

In one embodiment, the end of the lower plunger is further provided with a connector connected to the mover, and the connector is further provided with a plurality of oil inlet holes, and the well fluid is discharged from the oil inlet screen Accessing the oil suction chamber through the oil inlet hole.

In one embodiment, the oil pump further includes an oil discharge pipe and a grit pipe, the oil discharge pipe is connected to the bridge pipe, and the grit pipe is disposed inside the oil pipe, the oil pipe An annular space for grit is formed between the grit tube.

In one embodiment, the sealer assembly includes an outer cylinder, a connecting rod and a sealing assembly, the outer cylinder is disposed between the submersible linear motor and the oil pump, and the connecting rod is movablely disposed. The lower end of the connecting rod is fixedly connected to the mover, the upper end of the connecting rod is fixedly connected with the plunger, and the sealing assembly is disposed between the connecting rod and the outer tube.

In one embodiment, the sealer assembly further includes a scraper disposed between the connecting rod and the outer cylinder, and the outer cylinder is further provided with a drain hole, and the scraper will adhere to The impurities on the connecting rod are scraped off and discharged from the drain hole.

In one embodiment, the upper end of the outer cylinder is fixedly connected to the oil inlet screen through a seal upper joint, and the inside of the joint on the seal is provided with a buffer block for buffering the impact of the plunger. .

In one of the embodiments, the sealer assembly further includes two centralities disposed at opposite ends of the seal assembly.

The above system cancels the sucker rod of the existing oil production system, avoids the stroke loss caused by the elongation of the sucker rod, and avoids the energy loss caused by the self-weight of the sucker rod and the eccentric wear of the rod, and improves the system efficiency.

[Description of the Drawings]

The above and other objects, features and advantages of the present invention will become more apparent from the <RTIgt; The same reference numerals are used throughout the drawings to refer to the same parts, and the drawings are not intended to be scaled to the actual size. The emphasis is on the subject matter of the invention.

1 is a cross-sectional view showing a submersible linear motor production system of an embodiment;

Figure 2 is a partial enlarged cross-sectional view of the submersible linear motor of Figure 1;

Figure 3a is a partial enlarged cross-sectional view showing a state of the oil pump of Figure 1;

Figure 3b is a partial enlarged cross-sectional view showing another state of the oil pump of Figure 1;

Figure 4 is a partial enlarged cross-sectional view of the sealer assembly of Figure 1.

【detailed description】

The above described objects, features and advantages of the present invention will become more apparent from the aspects of the appended claims. Numerous specific details are set forth in the description below in order to provide a thorough understanding of the invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the invention, and thus the invention is not limited by the specific embodiments disclosed below.

It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or the element can be present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or.

All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. The terminology used in the description of the present invention is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and/or" used herein includes any and all combinations of one or more of the associated listed items.

Referring to FIG. 1 , a submersible linear motor production system of an embodiment includes a submersible linear motor 100 , an oil pump 200 , a sealer assembly 300 , and a respirator 400 integrally mounted in the ground. The oil pump 200 is disposed above the submersible linear motor 100, the respirator 400 is disposed below the submersible linear motor 100, and the sealer assembly 300 is located between the oil pump 200 and the submersible linear motor 100.

Referring to FIG. 2, the submersible linear motor 100 is a power source of the entire system, and includes a stator 10 and a mover 20 disposed in the stator 10 for linear motion.

The stator 10 includes a stator inner tube 14, a stator outer tube 13, and a plurality of coils 11 disposed between the stator inner tube 14 and the stator outer tube 13. The stator outer tube 13 is made of a metal material with good magnetic permeability, and its rigidity is considered, the magnetic circuit saturation of the motor can be avoided, the deformation of the motor is improved, and the internal structure of the motor is protected. The stator inner tube 14 is made of a non-magnetic wear-resistant metal material, and as a contact portion with the mover 20, the surface is required to be smooth and wear-resistant, and can be specially treated for surface hardening such as nitriding, chrome plating, spray welding, etc. Harsh environment in different oil wells. The coil 11 is formed by connecting three-phase coils which are wound by wires into individual circular copper (or aluminum) wire cakes and potted with epoxy resin. The coils 11 are arranged in the axial direction of the stator inner tube 14, and a silicon steel sheet assembly 12 is disposed between adjacent coils 11. The silicon steel sheet assembly 12 is formed by laminating a piece of silicon steel sheet, and has the characteristics of good magnetic performance and low loss. There is an insulating layer between the coil 11 and the silicon steel sheet assembly 12, and the material is an insulating material with good thermal conductivity to ensure good heat dissipation and insulation of the motor and improve the reliability of the motor. The stator 10 also includes a cable 15 that is coupled to the coil 11. The cable 15 can be an oil field-specific armor flat cable, one end of which extends to a ground control system (not shown). The cable 15 has a packing squeeze seal on the outlet of the motor to withstand a high pressure environment of 30 MPa. The stator 10 also includes a motor upper joint 16 and a motor lower joint 17 at both ends of the stator outer tube 13. The submersible linear motor 100 is coupled to the sealer assembly 300 via a motor upper joint 16 and to the respirator 400 via a motor lower joint 17. The motor upper joint 16, the motor lower joint 17, the stator inner tube 14 and the stator outer tube 13 form a closed cavity, and the coil 11 and the silicon steel sheet assembly 12 are protected. The epoxy resin is injected into the sealed cavity, so that the glue fills the gap inside the stator well, and the whole stator 10 is solidified into one whole, which greatly improves the rigidity and reliability of the stator.

The mover 20 includes a mover inner tube 21, a mover outer tube 22, a plurality of permanent magnets 23, a plurality of magnetic conductive rings 24, a plurality of wear rings 25, and two lock nuts 26. The mover inner tube 21 has a hollow tubular structure. The material of the permanent magnet 23 is preferably a neodymium iron boron material having high performance and high coercive force. The permanent magnet 23 has a substantially annular shape. A plurality of permanent magnets 23 are sleeved on the mover inner tube 21, and the magnetization direction of each of the permanent magnets 23 is an axial direction, and the magnetization directions of the adjacent two permanent magnets 23 are opposite. The magnetic flux ring 24 is also annular in shape and has the same diameter as the permanent magnet 23. A plurality of magnetic flux guiding rings 24 are sleeved on the inner rotor tube 21, and each of the magnetic conductive rings 24 is disposed between the adjacent two permanent magnets 23. The material of the magnetic flux ring 24 is a metal having good magnetic permeability. The wear ring 25 has a circular shape. A plurality of wear rings 25 are sleeved on the inner mover tube 21, and a plurality of permanent magnets 23 are disposed between each of the two wear rings 25. In this embodiment, a wear ring 25 is provided every five permanent magnets 23. The outer diameter of the wear ring 25 is slightly larger than the magnetic flux ring 23 and thus can protrude from the surface of the magnetic flux ring 24 and the wear ring 25. The material of the wear ring 25 is a hard alloy, has high hardness and good magnetic permeability. The wear ring 25 and the stator inner tube 14 are in contact with each other during motor operation, which can ensure smooth running of the motor and no vibration. The friction pair has high reliability and long service life. The outer tube 22 is sleeved outside the permanent magnet 23 and the magnetically permeable ring 24, and each of the outer tube 22 is located between the two wear rings 25. The outer diameter of the outer tube 22 is slightly smaller than the outer diameter of the wear ring 25 to ensure that it does not rub against the inner tube 14 of the stator. The outer outer tube 22 can be made of a metal that is not magnetically conductive. Since the permanent magnet 23 is inferior in corrosion resistance and the material is relatively brittle, the outer rotor 22 can effectively protect the permanent magnet 23 from corrosion and impact. A lock nut 26 is attached to both ends of the outer tube 22 for pressing the permanent magnet 23 and the magnetic flux ring 24 to prevent loosening.

During operation, according to the actual demand, the parameters are set by the numerical control device on the ground, and the power is supplied according to the specified program, so that the stator 10 generates a moving magnetic field. The stator magnetic field and the mover magnetic field generate an electromagnetic driving force, thereby driving the mover 20 to move up and down. Preferably, the two ends of the motor are sealed and form a closed cavity with the mover 20 and the stator 10, and the cavity is filled with lubricating oil. During the reciprocating motion of the motor, since the inner tube 21 of the mover has a hollow structure, the lubricating oil can quickly flow from the inside of the inner tube 21 of the mover, that is, from one end of the mover 20 to the other end to form a loop. Thereby reducing the resistance.

Referring to FIG. 3a, the oil pump 200 is a two-way plunger pump including a pump barrel 32, a plunger 34, a bridge tube 36, an oil inlet screen 38, and an oil outlet tube 39. The bridge tube 36 is sleeved outside the pump barrel 32 and forms a first return chamber 362 therebetween. The plunger 34 is movably disposed inside the pump barrel 32. The inner wall of the pump cylinder 32 and the outer wall of the plunger 34 need to be surface hardened, typically chrome plated. An oil inlet screen 38 is fixed to the lower end of the bridge tube 36 for filtering sediment in the well fluid.

The pump barrel 32 includes an upper pump barrel 322 and a lower pump barrel 324 that is fixedly coupled to the upper pump barrel 322. The upper pump cylinder 322 has a larger diameter than the lower pump cylinder 324. A fixed valve 321 is provided at the top end of the upper pump cylinder 322. The well fluid can enter the first return chamber 362 through the fixed valve 321 . A lower return hole 323 is also defined in the lower end of the upper pump cylinder 322.

The plunger 34 includes an upper plunger 342 and a lower plunger 344 that is fixedly coupled to the upper plunger 342. The upper plunger 342 is slidable up and down in the inner portion of the upper pump cylinder 322; the interior of the upper plunger 342 forms an oil suction chamber 341. An oil chamber 345 is formed between the top of the upper plunger 342 and the upper pump barrel 322. The top end of the upper plunger 342 is further provided with a swimming valve 346 through which the well fluid can enter the oil discharge chamber 345 through the stroke valve 346. The lower plunger 344 is slidable up and down in the inner portion of the lower pump barrel 324. The inside of the lower plunger 344 forms an oil suction chamber 343. A check valve 347 is also provided between the lower plunger 344 and the upper plunger 342. The well fluid can pass from the oil suction chamber 343 through the one-way valve 347 into the oil suction chamber 341. The diameter of the lower plunger 344 is smaller than that of the upper pump barrel 322, so that a second return chamber 364 is formed between the lower plunger 344 and the upper pump barrel 322. The first return chamber 362 is in communication with the second return chamber 364 through the return hole 323. A connector 348 is also provided at the end of the lower plunger 344. The plunger 34 is connected to the mover 20 of the submersible linear motor 100 via a connector 348. A plurality of oil inlet holes 349 are also formed in the connector 348. The well fluid can pass from the oil inlet screen 38 through the oil inlet 349 to the oil suction chamber 343.

The upper portion of the bridge tube 36 is connected to the oil outlet pipe 39 through a joint 37. A smaller diameter grit tube 392 is also disposed in the oil outlet pipe 39, and an annular space 394 for grit is formed between the oil discharge pipe 39 and the grit pipe 392, which is more advantageous for wear protection of the pump and the motor.

The operation of the oil pump 200 will be briefly described below with reference to Figures 3a and 3b.

Referring to Figure 3a, when the plunger 34 is descending, the fixed valve 321 is closed and the swim valve 346 and the check valve 347 are opened. The well fluid is filtered from the oil inlet screen 38 and enters the oil suction chamber 343, and then enters the oil discharge chamber 345 through the oil suction chamber 341. At the same time, the upper plunger 342 will compress the space of the second return chamber 364 when it descends, so the well fluid in the second return chamber 364 can enter the first return chamber 362 through the return hole 323, and finally enters and exits through the adapter 37. In the oil pipe 39.

Referring to Figure 3b, when the plunger 34 is ascending, the fixed valve 321 is opened and the swim valve 346 and the check valve 347 are closed. Since the upper plunger 342 compresses the space of the oil chamber 345, the well fluid in the oil discharge chamber 345 will enter the first return chamber 362 through the fixed valve 321 . A part of the well fluid enters the outlet pipe 39 through the adapter 37, and the other portion enters the second return chamber 364 through the return hole 323, and waits for the next time the plunger 34 descends to enter the outlet pipe 39.

As can be seen from the analysis of the upper motion state, the above-described oil pump 200 discharges oil outward in both the upper stroke and the lower stroke of the plunger 34, so that the oil recovery efficiency can be improved and the oil output can be increased.

It can be understood that in another embodiment, the diameter of the lower pump cylinder 324 can be the same as that of the upper pump cylinder 322, and the return hole 323 can also be omitted. When the plunger 34 descends, the well fluid passes through the filter from the oil inlet screen 38 and enters the oil suction chamber 343, and then enters the oil discharge chamber 345 through the oil suction chamber 341. When the plunger 34 is ascending, the well fluid in the oil discharge chamber 345 will enter the first return chamber 362 through the fixed valve 321 and then enter the outlet pipe 39 through the adapter 37. The oil pump 200 of this embodiment is a one-way type oil pump.

The sealer assembly 300 exists between the submersible linear motor 100 and the oil pump 200, and functions as a sealed motor, which simulates the well fluid and the sediment entering the motor from the upper part of the motor to ensure the reliability of the motor and prolong the life of the motor. .

Referring to FIG. 4, the sealer assembly 300 includes an outer barrel 40, a connecting rod 42, a seal assembly 44, and a scraper 46.

The outer cylinder 40 is generally a cylindrical tube. The outer cylinder 40 is disposed between the submersible linear motor 100 and the oil pump 200. Specifically, the lower end of the outer cylinder 40 is fixedly coupled to the motor upper joint 16 of the submersible linear motor 100 via a seal lower joint 402. The upper end of the outer cylinder 40 is fixedly coupled to the oil feed screen 38 of the oil pump 200 via a seal upper joint 404. A drain hole 41 is also formed in the outer cylinder 40. In the present embodiment, the inside of the seal upper joint 404 is further provided with a buffer block 47 for buffering the impact from the plunger 34 of the oil pump 200.

The connecting rod 42 is a solid rod that is movably disposed inside the outer cylinder 40, and its surface can be hardened, such as chrome plating. The lower end of the connecting rod 42 is fixedly coupled to the mover 20 of the submersible linear motor 100, and the upper end of the connecting rod 42 is fixedly coupled to the plunger 34 of the oil pump 200, thereby transmitting the up and down movement of the mover 20 to the plunger 32.

The seal assembly 44 is disposed between the connecting rod 42 and the inner wall of the outer cylinder 40. The function of the seal assembly 44 is to block impurities such as well fluids and sediment from entering the motor. In this embodiment, the seal assembly 44 is a combination of seals such as U-rings and MV-type seals. The sealing ring is made of wear-resistant and corrosion-resistant material to ensure the life and sealing of the sealer. The upper and lower ends of the sealing assembly 44 are respectively provided with a lock nut 43 for fixing and pressing the sealing assembly 44. The upper and lower ends of the sealing assembly 44 are also respectively provided with a righting block 45 for correcting the connecting rod 42 to ensure that it is located at the center of the outer cylinder 40.

A sand scraper 46 is disposed between the connecting rod 42 and the inner wall of the outer cylinder 40 and above the seal assembly 44. The upper end of the sand scraper 46 is made of a material having a certain elasticity, which can always be kept in contact with the connecting rod 42, thereby scraping off impurities such as sand adhered to the connecting rod 42 and from the outer cylinder 40. The drain hole 41 is discharged to the outside of the sealer assembly 300.

The respirator 400 is disposed at the lower end of the submersible linear motor 100 for the purpose of balancing the internal and external pressure of the motor, and at the same time reducing the probability of impurities entering the motor, improving the sealing effect, and improving the reliability and life of the entire system. The inside of the respirator 400 is filled with the same lubricating oil as the inside of the motor, and communicates with the inside of the motor to balance the internal and external pressure of the motor, so that the sealing effect is better. The tail pipe of the respirator 400 is long and is screwed to the bottom of the capsule protector. The gravity of impurities such as sediment is used to make impurities such as sediment difficult to reach the bottom of the respirator, further reducing the probability of impurities entering the motor and improving the sealing effect. Improve the reliability and longevity of the entire system.

The above-mentioned submersible linear motor production system has the following advantages:

(1) The system cancels the sucker rod of the existing oil production system, avoids the stroke loss caused by the elongation of the sucker rod, and avoids the energy loss caused by the self-weight of the sucker rod and the eccentric wear of the rod, and improves the system. Efficiency, especially for inclined wells and horizontal wells, provides a good solution.

(2) Since the pump of this system is installed above the submersible linear motor, it can ensure that the motor is always immersed in the well fluid, which is beneficial to the heat dissipation of the motor and also reduces the noise of the motor. At the same time, the motor running downhole can also avoid unintended workload and maintenance costs due to human damage. In addition, the existing well fluid of the system installed under the motor must pass through the inner hole of the mover, so the liquid output will be limited by the inner diameter of the mover; and the well fluid of the present scheme does not need to pass the inner hole of the mover. Therefore, the amount of liquid discharged is not limited.

(3) The upper end of the motor is provided with a sealer and the lower end is provided with a respirator. Therefore, the motor can be fully sealed to prevent the well fluid containing sand, gas, H2S, CO2, etc. from damaging the motor from entering the motor, so that the motor has high reliability. Long life, better adapt to the harsh environment of the underground.

The above-mentioned embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims

The utility model relates to a submersible linear motor oil production system, which comprises a submersible linear motor, an oil pump, a sealer assembly and a respirator installed in an underground;

The submersible linear motor includes a stator and a mover that moves linearly within the stator;

The oil pump includes a pump cylinder, a plunger, a bridge tube and an oil inlet screen, the pump cylinder is disposed in the bridge tube, the plunger is connected to an upper end of the mover, and a linear motion is formed in the pump cylinder, an oil chamber is formed between the plunger and the pump cylinder, and a first return chamber is formed between the bridge tube and the pump cylinder, and the oil inlet screen is disposed at the Illustrating the lower end of the bridge tube and communicating with the oil suction chamber inside the plunger;

The sealer assembly is disposed between the submersible linear motor and the oil pump;

The respirator is disposed at a lower end of the submersible linear motor for balancing pressure inside and outside the submersible linear motor.
The submersible linear motor oil production system according to claim 1, wherein the stator comprises a stator inner tube, a stator outer tube, and a plurality of coils disposed between the stator inner tube and the stator outer tube. The coil is wound into a circular wire cake by a wire and potted by epoxy resin, and a silicon steel sheet assembly is disposed between adjacent coils, and the coil is insulated from the silicon steel sheet assembly.
A submersible linear motor production system according to claim 2, wherein said stator further comprises a cable connected to said coil, said stator being connected to said ground control system via said cable.
The submersible linear motor production system according to claim 2, wherein the stator further comprises a motor upper joint and a motor lower joint at both ends of the stator outer tube, and the submersible linear motor passes through the motor An upper joint is connected to the sealer assembly and connected to the respirator through the motor lower joint, and the motor upper joint, the motor lower joint, the stator inner tube and the stator outer tube are injected There is glue to cure the entire stator as a whole.
The oil recovery system for a submersible linear motor according to claim 2, wherein the mover comprises the inner tube of the mover, the plurality of permanent magnets, the plurality of magnetic conductive rings and the plurality of wear rings, The permanent magnets are sleeved on the inner tube of the mover, the magnetization direction of each permanent magnet is an axial direction, and the magnetization directions of two adjacent permanent magnets are opposite, and the plurality of magnetic conductive rings are sleeved in the same On the inner tube of the mover, and each magnetic conductive ring is disposed between two adjacent permanent magnets, the plurality of wear rings are sleeved on the inner tube of the mover, between each two wear rings A plurality of permanent magnets are provided, and the plurality of wear rings form a friction pair with the stator inner tube.
The submersible linear motor oil production system according to claim 5, wherein the mover further comprises a plurality of mover outer tubes, each of the mover outer tubes being sleeved on the permanent magnet and the magnetic guide ring And located between two wear rings, the outer diameter of the outer tube of the mover being smaller than the outer diameter of the wear ring.
The oil recovery system for a submersible linear motor according to claim 5, wherein the mover further comprises two lock nuts disposed at two ends of the outer tube of the mover for pressing the permanent magnet and The magnetic flux ring.
The submersible linear motor production system according to claim 2, wherein the inner tube of the mover has a hollow structure, and the mover and the stator are filled with lubricating oil, and the lubricating oil is moved from the moving The inside of the inner tube flows through.
A submersible linear motor production system according to claim 1, wherein said pump cylinder comprises an upper pump cylinder and a lower pump cylinder fixedly coupled to said upper pump cylinder, said plunger including an upper plunger and The upper plunger is fixedly connected to the lower plunger, the inside of the upper plunger forms an oil suction chamber, and an oil chamber is formed between the upper plunger and the upper pump cylinder, and the top end of the upper plunger is further a swimming valve is provided, and the top end of the upper pump cylinder is provided with a fixed valve connecting the oil discharge chamber and the first return chamber, the lower plunger A second return chamber is formed with the upper pump barrel, and the second return chamber communicates with the first return chamber.
The oil recovery system for a submersible linear motor according to claim 9, wherein an inner portion of the lower plunger forms an oil suction chamber, and a check valve is provided between the lower plunger and the upper plunger. Liquid enters the oil suction chamber from the oil suction chamber through the one-way valve.
The submersible linear motor oil production system according to claim 9, wherein the end of the lower plunger is further provided with a connector connected to the mover, and the connector is further provided with a plurality of oil inlets. a hole through which the well fluid enters into the oil suction chamber through the oil inlet hole.
The oil recovery system for a submersible linear motor according to claim 9, wherein the oil pump further comprises an oil outlet pipe and a grit tube, wherein the oil discharge pipe is connected to the bridge pipe, and the grit pipe is disposed at An annular space for grit is formed between the oil discharge pipe and the grit pipe.
The submersible linear motor oil production system according to claim 1, wherein the sealer assembly comprises an outer cylinder, a connecting rod and a sealing assembly, and the outer cylinder is disposed on the submersible linear motor and the pumping Between the oil pumps, the connecting rod is movably disposed on the outer cylinder, the lower end of the connecting rod is fixedly connected with the mover, the upper end of the connecting rod is fixedly connected with the plunger, and the sealing assembly is arranged Between the connecting rod and the outer cylinder.
The submersible linear motor oil production system according to claim 13, wherein the sealer assembly further comprises a scraper disposed between the connecting rod and the outer cylinder, and the outer cylinder is further provided with a sewage discharge a hole that scrapes off impurities adhering to the connecting rod and is discharged from the drain hole.
The submersible linear motor oil production system according to claim 13, wherein the upper end of the outer cylinder is fixedly connected to the oil inlet screen through a seal upper joint, and the inside of the seal upper joint is provided a buffer block that cushions the impact of the plunger.
The submersible linear motor production system of claim 13 wherein said sealer assembly further comprises two centrally located blocks disposed at opposite ends of said seal assembly.